Korey Hall, back for the second week after missing four games with a calf injury, clearly is the No. 2 fullback ahead of Quinn Johnson.
"Special teams, I mean, he's a demon," McCarthy said. "Very productive special-teams player."
As for starter John Kuhn, McCarthy said: "He's a very good pass protector, he's a good inside runner, he's a better receiver than I think we all thought when we got him and he's a hell of a special-teams player. Diverse football player."